Subject: Re: Respiratory Sounds database From: Linda Seltzer <lseltzer@xxxxxxxx> Date: Mon, 8 Aug 2011 07:01:19 -0700 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>> Dear list, > > For a Ph.D. project by one of my students working on analysis-based > synthesis of lung sounds, That could be a daunting task. Respiratory sounds are delicate. With respect to vocal sounds rather than lung sounds, when I composed Autumn Cove, Spring Night a long time ago I wanted to achieve the effect of sounds floating in air. At first I tried linear prediction of speech plus time stretching with the phase vocoder (that was before the popularity of algorithms like PSOLA). The vocal chords are so powerful that the result sounded like a jet engine. I had to use the Chinese erhu (bowed strong instrument) as the basis for analysis. I used elliptic filters with 30+ dB of ripple, on the verge of instability. That worked out well. Some filter design packages will let you design such filters and some will not. I think I used the old IEEE filter design package in Fortran. This was practical musique concrète composition rather than a theoretical analysis of the lungs. L. Seltzer, “A Confluence of Computer Music and Ancient Chinese Aesthetics,” International Conference on Computer Music, Waseda University, Tokyo, Japan, September 1993. Linda Seltzer lseltzer@xxxxxxxx